Enable Milvus hybrid search

[moria97]

• Insert data with both dense and sparse embedding
• Remove local bm25 dependencies for Milvus Store
• Modify MilvusVectorStore to support Text search mode

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
4029	2247	56%	50%	🟢

New Files

File	Coverage	Status
src/pai_rag/modules/index/my_milvus_vector_store.py	21%	🟢
src/pai_rag/modules/index/sparse_embedding.py	42%	🟢
TOTAL	31%	🟢

Modified Files

File	Coverage	Status
src/pai_rag/modules/index/bm25_index.py	93%	🟢
src/pai_rag/modules/index/store.py	60%	🟢
src/pai_rag/modules/retriever/retriever.py	65%	🟢
TOTAL	73%	🟢

updated for commit: 9f9b44e by action🐍